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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Rheologica acta 37 (1998), S. 182-188 
    ISSN: 1435-1528
    Keywords: Key words Polymer melts ; viscoelasticity ; birefringence ; elongational flow
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Abstract Birefringence in liquid polymers offers the possibility of obtaining information about stress in complex flows. In this work, this is done for extensional flows of polyisobutylene in a “breathing bubble” rheometer. In this type of rheometer, a bubble consisting of an incompressible, low-viscosity fluid (usually water) is injected into the sample with a nozzle. Expanding or collapsing the bubble by adding or removing water induces biaxial or uniaxial extension in the surrounding sample. The pressure difference between the bubble and the surroundings can be measured and compared to the predictions of constitutive equations. This measurement only gives one integral value for a complex flow history. In this paper, the birefringence around the bubble is measured in order to learn more about the flow. This is done by comparing pressure and birefringence results to those of standard constitutive equations for a polyisobutylene sample. A good agreement between the pressure and optical measurements and the theory is found with a single value of the stress-optical constant.
    Type of Medium: Electronic Resource
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  • 2
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    Studien Verlag
    Publication Date: 2022-09-01
    Description: Austria was among the first countries after WWII where the Fulbright Program was set up. In October 1950, a Fulbright Commission convened for the first time in Vienna to arrange for the annual exchange of about 100 scholars and scientists, and students, between the US and Austria. This book describes the conditions of when the program was operationalized within the Austrian academic landscape and analyses the impact of academic exchange in its early period, up until 1964.
    Description: Das Fulbright Program wurde 1946 eingerichtet und war dem Austausch von WissenschaftlerInnen und Studierenden zwischen den Vereinigten Staaten und verschiedenen anderen Ländern gewidmet. Im Oktober 1950 trat eine Fulbright Commission erstmals in Wien zusammen, um die Planung für den Austausch von jährlich rund 100 Personen zwischen Österreich und den USA aufzunehmen. Der vorliegende Band untersucht die Wirkung des Programms in Österreich in seiner Anfangsphase (bis ca. 1964).
    Keywords: Österreich ; Ideengeschichte ; Wissenschaftsgeschichte ; transatlantische Beziehungen ; Universität ; historische Entwicklung ; Zweite Republik ; Wissenschaftspolitik ; Vereinigte Staaten von Amerika ; Fulbright-Kommission ; Fulbright-Programm ; Sozialwissenschaften ; Wien
    Language: German
    Format: image/jpeg
    Format: image/jpeg
    Format: image/jpeg
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